Maybe he'd like to get to know you better, but he's shy and unsure what to say in an actual message. Or, he might be the kind of guy who winks at a lot of woman and can't be bothered sending a message. If this is the case, it doesn't mean much.
The law of conservation of mass (from Lavoisier) states that mass can be neither created nor destroyed (but it may change its form into something that is not desired, such as heat with an engine) or that in a chemical reaction, the total mass of the reacting substances is equal to the total mass of products formed.
Although energy can change forms, all energy in a closed system and must remain constant. 1  The law of Conservation of Mass: Mass can not be created or destroyed. 2  The law of Conservation of Energy: Energy can not be created or destroyed. 3  The law of Conservation of Mass-Energy. Neither energy nor mass can be created or destroyed, instead mass is conserved as energy or energy is conserved as mass. A combination of the law of conservation of energy and conservation of mass (based on E = mc2 (energy mass equivalence)).